The “Cistern,” constructed in 1927, was Houston’s first drinking water reservoir. (Courtesy Buffalo Bayou Partnership)

During construction on the Buffalo Bayou Partnership‘s (BBP) Buffalo Bayou Park Shepherd to Sabine project—which began in 2010 and is seeking to transform the downtown park into a catalyst for making Houston a more livable city—workers rediscovered an underground concrete cistern that had been built in 1927 as the city’s first drinking water reservoir. It performed decades of service before springing a leak that couldn’t be located or contained, at which point the 87,500-square-foot subterranean chamber was sealed up and forgotten. Today, the old piece of infrastructure is an inspiring, if somewhat erie space. Accessed through manholes and 14-foot ladders, the man-made cavern features row upon row of cathedral-like 25-foot-tall columns standing in several inches of still water. BBP would like to see the space adaptively reused, but such an endeavor currently lies outside the scope of its Shepherd to Sabine project. So to drum up interest in renovating the space, the organization commissioned Houston company SmartGeoMetrics to create a 3D fly-through of the cistern.